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RT1 Rotary Thread File Small


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  • Ideal for restoring Inch, Metric, Pipe, Male, and Female Threads
  • Can restore Metals, Hardened Metals, Ceramics, Glass, and Plastics
  • Easy to restore deep internal threads
  • Made with strong and durable materials
  • Engineered and Patented in the USA
  • For bulk orders, please contact us
  • Product Sheet Specification
SKU: RT1-LP02 Category:


Restore dent, dinged, or damaged threads in nuts and bolts within a minute with the RT1 Rotary Thread File! Restoring threads on the smallest bolts and getting into deep nuts without worrying about getting the right pitch is exactly what you’ll get with the RT1.

Ideal for restoring Inch, Metric, Pipe, Male, and Female Threads made out of Metals, Hardened Metals, Ceramics, Glass, and Plastics, the RT1 has become the go-to thread repair tool for both home improvement enthusiasts as well as industry professionals.

What is the RT1 Rotary Thread File Used For?

Damaged threads usually lead to unsecured pieces of machinery that can cause further machine damage or worse, hazardous accidents. Before, plenty of people used to work with Taps and Dies and found it difficult and time-consuming to restore threads on their own, so they end up getting expensive replacement parts or hiring a professional to do repairs.
With the RT1 Rotary Thread at your disposal, you no longer need to worry about costly repairs and replacement parts. You can save hundreds of dollars in repairs and have your damaged threads fixed in under a minute with the RT1’s universal threading design.

The Rotary Thread file is the only tool you can use for restoring loose inner and outer threads. Unlike taps and dies that you need to switch up depending on what part you are trying to restore, you can use one RT1 Rotary Thread file to restore either a nut or bolt.

The RT1 was designed by industry professionals for in-home projects, automotive, farm & ranch, and industrial use. Whether you’re a beginner or a professional, all it takes is a few seconds to restore threads back to their perfect condition.

All you need to do is attach the RT1 to your die grinder, secure the threaded part you want to restore, start along the good threads, and slowly make your way towards the damaged thread. No experience is needed!

Fix Any Threaded Tool or Material!

The RT1 Rotary File Thread can help you quickly restore threads made out of materials including Metals, Hardened Metals, Ceramics, Glass, and Plastics.

Its ingenious universal design is what makes it possible to cut hours of threading work into mere seconds. Unlike traditional thread repair tools that come in standard sizes, the RT1 is an all-in-one tool that eliminates the need for switching when you’re working with both external and internal threads.

The small ⅜-inch diameter of its head makes it quick and easy to restore even the deepest damaged threads in nuts. No more worrying about pitches and diameters, the universal 60-degree “V” angle ensures you will get the right pitch every time whether you’re working on Inch, Metric, Pipe threads.

Quick Storage & Easy Maintenance

The RT1 is made with highly durable materials that can last you years of regular use. Its small size makes it ultimately easy to store in any toolbox in your home or shop.

You can also prolong its lifespan and get the best performance every time by using tapping oil when restoring threads. It is also recommended to add light pressure to the tool when you’re working on threads to reduce the pressure on the tool.

To get the best performance during every use, we recommend you clean the tool with non-flammable paint thinner after restoring threads.

Available Replacement Parts

Lost your Rotary Thread file? Don’t fret, our Rotary Thread files are super affordable and can easily be ordered online! We offer files, grooves, glands, mandrels, and collets by the piece on our website.

Additional information

Weight 0.5 lbs
Dimensions 7.63 × 3.69 × 0.5 in
Average Rating


( 17 Reviews )
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17 Reviews For This Product

  1. 17

    by Maria E. Shipman


  2. 17

    by Patrick

    This makes quick work of fixing bent threads using a rotary tool.

  3. 17

    by MV

    It looks great, but it was too large for the job I had at the time. I’m sure I’ll find a use for it at some point.

  4. 17

    by skip welsh

    As advertised!

  5. 17

    by Ernest R. Martinez

    Worked like a charm, as advertised!

  6. 17

    by Marvin

    Keys to success with this little gem of a tool.FIrst of all, I am not at paid representative of this tool! I love tools that perform as advertised! And I love quality tools. This tool saved me hundreds of dollars and countless hours of work. My outboard motor thermostat housing is a 1-1/2″ aluminum threaded bore and has a “composite” cover. The threads are 16 TPI (threads per inch) when I went to unscrew the “composite” cover to gain access to the thermostat the whole threaded piece snapped away leaving all the threaded piece inside the housing bore! So I had to chip away the threaded section of the cover (plastic) from the aluminum housing with a diamond point chisel (another gem of a tool.) While I was very careful not to damage the aluminum threads while breaking the plastic threads out I managed to nick a couple of places but not too bad. I looked for a 16 TPI internal thread file online and boy are they expensive. And they are limited in reach on an internal thread. I had never heard of this Rotary Thread File tool before. Being a retired machinist/millwright I often could of used this tool many times. Anyway I came upon the Rotary thread file site. And ordered the 754, 4″ long little gem. I already had my comp. hose and 30,00 RPM die grinder ready before the tool arrived 3 days later, but thought this was overkill, and if the threads weren’t perfect I would ruin my new composite cover threads? This wasn’t a 30,000 RPM moment. So, I placed this magic tool it into the not easily accessible threaded bore and slowly began moving it into the damaged area and spun it with my right hand fingertips while supporting it with my left hand I could feel it cutting. I used it dry with no cutting fluids so I could blow the shavings and deeply embedded corrosion out from the bore. (thank you saltwater) After about 10 minutes I was able to hand thread my new composite cover in with two fingers. I Assembled the thermostat housing with new gaskets and “O” ring, test ran engine with no leaks. What a cool little tool, I used it on all the threads to clean the deeply imbedded corrosion in the bottom of the threads. All by hand. It is also a good thread chaser and cleaner. This is an ingenious tool! All threads are the same angle, (60 degrees) fine, (SAE) coarse, National, Metric, Pipe, etc., this little tool is the perfect angle of the thread, thats why it works! It even works on any different amounts of thread per inch, (Pitch) because they are still 60 degrees. It isn’t designed for acme threads (Drilling rig and valve stems) and other mophodite or speciality threads. But at your request I believe you can special order the correct one for those. So it will work on any normal thread, especially on all the threads my retired a#* will come across. This will be a hot item in everyone’s toolbox. Don’t bother to, watch the YouTubers demonstrating this tool. (They were traveling the wrong way, attacked bad threads from the top) etc. etc. (it does make for a “How Not to Grind Threads With a Rotary Tool” video). You’ll want to reach through the screen and grab it from their hands and show them the right way to use this tool, with finesse and much better results. After watching these guys work and mangle some already mangled threads (I wouldn’t let them check the air in my tires!) But guess what when they finished with their “hope for the best moment”, they were successful, it wasn’t pretty but it does show that you don’t need any special skills to have success with this little tool! I never used this tool in a Rotary tool such as a die grinder. (Ididn’t need too!) But I have used all types of grinders including high speed air grinders many, many, times over the period of a 42 year career of Pipe fitter/welder and Machinist/Millwright. From that experience I think I can Suggest 5 Key tips to help you use this tool with confidence for the squemish or nervous type working with power tools. (1) As with all rotating tools and grinders they need to be used in a certain rotational direction in relation to your direction of travel to avoid kick-back. So attack the bad thread area from “under” the front part of thread with the bottom of stone rotating up toward that area. You should learn the rotation of the tool you are using before starting. For this example let’s figure Clockwise and counterclockwise is with the tool in your hand looking from the rear of the tool to the disc or stone. Cut with the tool traveling to the left if your tool rotates clockwise. Cut with the tool traveling to the right if your tool rotates counterclockwise. This keeps the tool from climbing up from the bottom of the threads and skimming on the top of the thread uncontrollably. (2) Prop your tool hand. Find a way to support your tool to give you better control. Use both hands. (3) Make a dry run with the tool disconnected from power. This will give you the feel of proper placement of the tool, especially if you are repairing fine threads. 4) Hold the tool perpendicular to the threads at all times. If you have to stop to reposition, than do so, but get another spot to prop. Remember you can’t travel very far without loosing your 90 degree perpendicular hold. (5) Finally don’t work your stone. Let the stone do the work. Move the stone very slowly with very very light pressure and try to approach the bad thread with the rotating stone at the bottom of the groove. You may not be able to attack it from the top of the thread and maintain control. You’ll have better control if you use the bottom of the groove as a guide working into the damaged area, don’t rush and don’t try to make the repair in one pass. There is a certain amount of finesse needed here! Taking your time yields better results. If you use these steps you could probably use it by feel alone if it gets hard to see at times. If this happens slow down and let the tool tell you if your “in the groove”. Good Luck!Hopefully these steps dont scare you. These tools are simple to use! Granny could use them. These steps are to make you and some of the “YouTubers” more informed with basic rotating rools use and to teach you to think every job out ahead of time. Sorry I know these steps were similar to a safety meeting and meant for someone with little to no experience. But if they helped you, your welcome. If you already knew these steps your welcome too. It doesn’t hurt to refresh!! LOL . Good Luck! & Work safe!

  7. 17

    by Robert Blankenship

    Repaired stud threads on my truck.

  8. 17

    by FXE

    Chasing fine threads with a dremel tool requires a steady hand or you will ruin the part.V cutter is hard to hold steady and will jump around. Tool works ok but you will need a v file to completeThe job

  9. 17

    by BrdHntr

    This thing works well. I’m a machinist and everyone brings thier screwed up threads to me to repair. This has saved the day especially on internal threads many times.

  10. 17

    by Skeevatz

    I have to say, I was skeptical but this tool really got me out of a bind! I was rebuilding a rearend on a car and somewhere along the line the threads by the hubs were damaged. I could not get the nut to start and it was clear to see the malformed threads. After going over the threads a few times with this bit in a Dremel, the nut went right on. Saved me a ton of rework and a trip to the machine shop – or having to purchase a massive die. The price is a no-brainer, I highly recommend.

  11. 17

    by T. R. Stedman

    Concept of tool really good when used in good hands however the shank of tool is too short, it would only reach part way into threaded bore in my case and chuck of rotating tool got in the way. It will be a usefull addition to my rethreading repertoire but next job not this one.

  12. 17

    by Glenn Lord

    I had a 1 inch shaft on my disk plow that the threads had been boogered by a loose nut and heavy shims. This tool straighten them out in ten minutes.

  13. 17

    by William Edwards

    It’s very rare these days that things actually work, and this thing worked. Saved me $985!. We have a firetruck and one of the hose reels threads had corroded to the point of no return. The replacement cost was extremely expensive as the thread is attached to one piece and can not be replaced. I gave this thing a try as a hail-mary and it actually worked. Half of the threads were on the backside that I couldn’t see so I just followed the front threads and prayed that i wouldn’t jump over a thread. Followed it all the way back around and kept going. Used a little Brakleen to clean off the grit and the coupler fit right on first time around. I still cant believe it.

  14. 17

    by John Sommers

    This Rotary File worked just like I hoped it would. I just occasionally have threads to fileso it should last me a long time. I recommend this file.

  15. 17

    by Kong Moua

    This thing was actually very helpful.

  16. 17

    by Lake Place

    I bought this to repair the socket for the ride guides on my boat trailer. The sockets are 1.25 in pipe couplers welded to the trailer, and the threads rust over time. This tool worked great!

  17. 17

    by Robert Crissinger

    Great tool to clean up buggered threads

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